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Clang on Windows
by Matthew Musto 31 Jul '14

31 Jul '14

I attempted to run Clang 3.4.1 on Win 8.1 with horrible results as evident on the current master regression summary here: http://www.boost.org/development/tests/master/developer/summary.html Besides the fact that boost identifies it as linux clang and there appears to be numerous other issues with the b2 script, has anyone had any success with this? The reason I ask is AMD is using LLVM for their heterogeneous development and I'm trying to see if boost will be something I can count on. Thanks, -Matt

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b2 headers is unreliable on 1.56 on Windows
by Niall Douglas 30 Jul '14

30 Jul '14

Anyone else found that b2 headers in 1.56 randomly misses things to hard link on Windows? If you run it four or five times it eventually hard links everything through monte-carlo, but it is a bit annoying. Niall -- ned Productions Limited Consulting http://www.nedproductions.biz/ http://ie.linkedin.com/in/nialldouglas/

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Lock free condition_variable or using shared_lock
by Kirk Liberty 30 Jul '14

30 Jul '14

I'm not too familiar with the mechanisms which underlie mutexs and conditionals, which is why I'm asking this question. Is it possible to modify condition_variable so that wait() can be called on shared_lock? The use case would be it is acceptable to release all threads waiting on a condition_variable when notify_all() is called. Using a unique_lock, every thread who wakes up will then have to obtain the lock before proceeding; this being a potential bottleneck. An even more performant alternative to using shared_lock would be with a dummy lock never blocks when dummy_lock.lock() is called. These are things I would like to contribute, but I need would need some guidance and a review of feasibility. Thanks for the help, Kirk

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News about proposed Boost.Application library
by Renato Forti 30 Jul '14

30 Jul '14

Hi All, This e-mail is only to inform news about proposed Boost.Application library. We have done many updates on version 0.4.9, see: - MinGW support; - The ‘auto_handler’ class to bind ‘stop’, ‘pause’, ‘continue’ and ‘single instance’ handlers automatically; - New samples for ‘auto_handler’; - Many fix and improvements on ‘Windows Server’ (Service API) mode; - Simplification of ‘handlers’ creation, now application context can by passed on constructor of functor, or user can use global version of it; - Docs are updated to version 0.4.9; - And many others small fixes. To know more, please visit: https://github.com/retf/Boost.Application Article (0.4.8) http://www.codeproject.com/Articles/756866/Build-a-Server-Application-using… (Prize winner in Competition "Best C++ Article of April 2014" ) Thanks

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[trac] Adding new components (Align, Type_Index)
by Michel Morin 30 Jul '14

30 Jul '14

Wouldn't it be better to add newly introduced libraries Align: glenfe (Glen Fernandes) Type_Index: apolukhin (Antony Polukhin) to trac components? Regards, Michel

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[quickbook] disambiguate overloaded function
by Benedek Thaler 30 Jul '14

30 Jul '14

Hi, I'm using quickbook and doxygen to generate my documentation. Suppose I have the following functions: func(int); func(std::string); They have separate reference pages, I'd like to link to them. However, I can't specify which one I mean using quickbooks funcref construct: [funcref func text] // results in: Reference to function 'func' is ambiguous. How can I specify the overload? Thanks, Benedek

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Re: [boost] [geometry] Querying for Points nearest to a Segment.
by Adam Wulkiewicz 30 Jul '14

30 Jul '14

2014-07-29 3:07 GMT+02:00 Jeremy Murphy <jeremy.william.murphy(a)gmail.com>: > Veering slightly off topic but still related to Geometry development, I've > hit some hurdles with the rtree index. I could create an index of points > easily but then couldn't query for the nearest neighbour of a segment. (I > assume this is simply not supported at present; is it forthcoming?) So I > created a ring or polygon from the segment and tried to query for the > points that it covers/intersects, which is a feature listed in the > documentation, but I've hit this compilation error: > > > /usr/include/boost/geometry/algorithms/detail/overlay/get_turn_info.hpp:932:32: > error: no matching function for call to > ‘boost::geometry::model::referring_segment<const > boost::geometry::model::d2::point_xy<double> >::referring_segment(const > boost::geometry::model::point<double, 2ul, > boost::geometry::cs::cartesian>&, const > boost::geometry::model::point<double, 2ul, > boost::geometry::cs::cartesian>&)’ > > This constructor for referring_segment looks OK to me, except maybe for the > 'const' qualifier on the arguments? > Which version of Boost are you using? Indeed nearest(segment, ...) shouldn't work in 1.55. However intersects(ring_or_poly) should. Could you prepare some minimal failing example? E.g. this compiles for me, using develop branch (upcomming 1.56) or 1.55 without one, marked line: #include <boost/geometry.hpp> #include <boost/geometry/index/rtree.hpp> #include <boost/geometry/geometries/segment.hpp> #include <boost/geometry/geometries/ring.hpp> namespace bg = boost::geometry; namespace bgi = bg::index; typedef bg::model::point<double, 2, bg::cs::cartesian> P; typedef bg::model::segment<P> Seg; typedef bg::model::ring<P> Ring; typedef bg::model::polygon<P> Poly; typedef P V; int main() { typedef bgi::rtree<V, bgi::linear<16, 4> > RT; //typedef bgi::rtree<V, bgi::quadratic<16, 4> > RT; //typedef bgi::rtree<V, bgi::rstar<16, 4> > RT; RT rt; V v; rt.query(bgi::nearest(Seg(), 1), &v); // Using 1.55 without this line rt.query(bgi::intersects(Ring()), &v); rt.query(bgi::intersects(Poly()), &v); } Regards, Adam

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[1.56.0 b1] Issue with mpl/is_convertable/asio
by Thomas Suckow 30 Jul '14

30 Jul '14

In testing '1.56.0 Beta 1' I have found that I am unable to compile https://github.com/splunk/pion on RHEL6_x64 Pion compiles fine with 1.55.0 I suspect the recurring "anonymous enum" is the kicker, though I am not sure where to even begin in diagnosing this. error: ‘const boost::asio::detail::buffer_sequence_adapter_base::<anonymous enum>&’ is/uses anonymous type error: no type named ‘type’ in ‘struct boost::is_convertible<const boost::asio::detail::buffer_sequence_adapter_base::<anonymous enum>&, const boost::iterator_range_detail::iterator_range_tag&>’ error: ‘value’ is not a member of ‘boost::mpl::aux::nested_type_wknd<boost::is_convertible<const boost::asio::detail::buffer_sequence_adapter_base::<anonymous enum>&, const boost::iterator_range_detail::iterator_range_tag&> >’ Full error log: http://pastebin.com/yeScQCpx If I get a chance I will see if I can reproduce this on a more modern compiler. Any assistance in correcting this before the 1.56.0 release would be appreciated. It also may or may not be related to http://thread.gmane.org/gmane.comp.lib.boost.devel/253259/focus=253261 Regards, Thomas

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quince: queries in C++ expressions
by Michael Shepanski 29 Jul '14

29 Jul '14

Hello, boost! I've released a library called "quince", which lets you use a relational database in C++ rather than SQL. So it provides an EDSL to wrap the SQL syntax, it converts between C++ types (including user-defined class types) and SQL column types, and it enforces type safety at compile-time. I wanted to ask whether there would be an interest in this for boost, so I subscribed to this list today, and for the first time I discover Roland Bock's sqlpp11, which does all of those things too. First of all I'd like to say: nice work Roland! The truth is, if I had seen sqlcpp11 earlier, I would not have had felt the need to write quince. Nevertheless, I did write it, and so of course it has a different set of features. The full doco is at http://quince-lib.com, but let me quickly point out a few differences from sqlpp11. 1. If you want some class to be mapped into SQL data, quince lets you write this sort of thing: struct point { float x; float y; }; QUINCE_MAP_CLASS(point, (x)(y)) extern database db; table<point> points(db, "points"); The macro QUINCE_MAP_CLASS uses a bit of Boost.Preprocessor magic and a bit of template metaprogramming to produce all the statically typed metadata that quince needs, regarding the user's type. There is no code generation step. 2. Quince's EDSL looks somewhat different. This is my first day as a student of sqlpp11, so I'm not really qualified to define the distinctions, but I think part of it is that sqlpp11 exposes the concept of column aliases, where quince does not, and quince is preoccupied with the idea of compositionality, in a way that sqlpp11 is not (as far as I know). Anyway you can see an example of the quince EDSL here: http://quince-lib.com/getting_started.html . 3. Just as sqlpp11 uses /connectors/, quince uses /backend libraries/, or /backends/. Currently I provide backends for PostgreSQL and sqlite. Unlike sqlpp11, however, I have not yet published the interface between quince and the backends. It's no secret --the whole lot is open source-- but I'm not yet ready to declare that I know all the customization points I'm going to need. 4. Quince provides mappings for std::tuple<T, ...> and boost::optional<T>, whenever it provides mappings for the Ts. E.g. a boost::optional<int32_t> is mapped as an INTEGER column with its NOT NULL constraint turned off. If you have a query q1 that produces results of type T1, and a query q2 that produces results of type T2, then q1.left_join(q2, some_predicate) produces results of type std::tuple<T1, boost::optional<T2>>. 5. An application can customize the representation of data in a particular database, or a particular table. 6. Quince does not currently provide bulk insert. (It's on my to-do list.) I've barely scratched the surface, but right now I have the impression that both products have their distinctive pluses. Keen to know your thoughts. Regards, --- Michael

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name of boost 1.56 tarball
by Menelaos Karavelas 29 Jul '14

29 Jul '14

Hello. Unlike previous versions which are named with underscores only, the boost 1.56 b1 tarball is named boost-1_56_0_b1.{zip, tar.gz, tar.bz, 7z}. Unpacking the tarball creates a boost-1_56_0_b1 directory instead of the expected one boost_1_56_0_b1 See also: http://sourceforge.net/projects/boost/files/boost/1.56.0.beta.1/ http://sourceforge.net/projects/boost/files/boost/1.55.0/ http://sourceforge.net/projects/boost/files/boost/1.54.0/ http://sourceforge.net/projects/boost/files/boost/1.53.0/ (older versions also follow the underscore filename pattern). Is there any particular reason for doing this? I suspect that it might cause problems to scripts looking for a specific pattern for the boost tar file and/or directory. All the best, - m.

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[functional/hash] Interface-breaking changes to hash_combine
by Joaquin M Lopez Munoz 29 Jul '14

29 Jul '14

Hi, There's been a number of internal changes to the implementation of boost::hash_combine during this year, with the result that the documented procedure: http://www.boost.org/doc/html/hash/reference.html#boost.hash_combine namely, seed ^= hash_value(v) + 0x9e3779b9 + (seed << 6) + (seed >> 2), is no longer followed in all cases. This is a backwards compatibility breach --at the very least I think it should be documented. Best, Joaquín M López Muñoz Telefónica

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News about proposed Boost.Application library
by Matus Chochlik 29 Jul '14

29 Jul '14

On Tue, Jul 29, 2014 at 9:39 AM, Klaim - Joël Lamotte <mjklaim(a)gmail.com> wrote: > > It would be nice if get_symbol returned a smart pointer that contained a > shared_ptr to the library. When all such references are released, the > library can be unloaded. > > > > I disagree. In my experience it would be more useful if it contained a > weak_ptr to the library, with a centralised system keeping all loaded > libraries alive and allowing the used to unload the library explicitely. > The get_symbol return type would then be testable. > That way it is easier to find issues related to plugins and its still > possible for the user to prevent these issues at runtime. > +1

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[geometry] convex_hull: dispatch implementation details
by Jeremy Murphy 29 Jul '14

29 Jul '14

Hi, just wondering why boost::geometry::convex_hull is implemented with that dispatch-struct-apply business? Is it because of the two forms of convex_hull: output reference and output iterator? I'm writing a concave_hull implementation, so I'm wondering whether I should emulate the conventions in the convex_hull implementation. Thanks, cheers. Jeremy

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Release branch will be closing Monday night.
by Marshall Clow 28 Jul '14

28 Jul '14

We will be “closing” the release branch late Monday night (Pacific Daylight time) in preparation for building a 1.56.0 release candidate on Tuesday morning. [ Actually, we’re just going to stop the automatic merging to the super-project, but … ] Please refrain from committing to the “master” branch of your libraries after 11:59 Monday night. (unless you have specific permission from the release managers) Thank you. — Marshall

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Merging Pull Requests
by Axel Ismirlian 28 Jul '14

28 Jul '14

I have made some pull requests in several submodules of boost regarding compatibility changes for AIX several weeks ago. Is there any way to get them more attention? I have received no indication on most of them that they have been seen by their corresponding maintainers. Sincerely, -Axel

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[wave] preprocess fails using b2
by Fletcher, John P 28 Jul '14

28 Jul '14

I have been using b2 to build the preprocessed files for boost phoenix. When I try to do this it now fails with a failure to build thread.cpp "g++-4.6" -ftemplate-depth-128 -O3 -finline-functions -Wno-inline -Wall -pedantic -pthread -Wextra -Wno-long-long -Wno-variadic-macros -Wunused-function -pedantic -DBOOST_ALL_NO_LIB=1 -DBOOST_SYSTEM_STATIC_LINK=1 -DBOOST_THREAD_BUILD_LIB=1 -DBOOST_THREAD_DONT_USE_CHRONO -DBOOST_THREAD_POSIX -DBOOST_WAVE_SUPPORT_THREADING=0 -DNDEBUG -I"../../.." -c -o "../../../bin.v2/libs/thread/build/gcc-4.6/release/link-static/threading-multi/wavetool-on/pthread/thread.o" "../../../libs/thread/src/pthread/thread.cpp" ../../../boost/ref.hpp:32:25: error: redefinition of â€˜class boost::reference_wrapper<T>â€™ ../../../boost/core/ref.hpp:59:25: error: previous definition of â€˜class boost::reference_wrapper<T>â€™ ../../../boost/ref.hpp:56:75: error: redefinition of â€˜template<class T> const boost::reference_wrapper<T> boost::ref(T&)â€™ ../../../boost/core/ref.hpp:131:74: error: â€˜template<class T> const boost::reference_wrapper<T> boost::ref(T&)â€™ previously declared here . It looks as though it is picking up two copies of the header file ref.hpp. This is the case with both gcc 4.6 and also gcc 4.9.0 It is not clear to me where the source file is coming from. At the moment all the libraries in my modular boost are checked out as develop. This is meaning that I cannot update my preprocessed files. Please advise me what to do. Thanks John

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[1.56.0] Beta 1 Available
by Marshall Clow 28 Jul '14

28 Jul '14

Boost release 1.56.0 beta 1 is now available from SourceForge See http://sourceforge.net/projects/boost/files/boost/1.56.0.beta.1/ This release contains 2 new libraries: * Align: Memory alignment functions, allocators, and adaptors, from Glen Fernandes. * Type_Index: Runtime/Compile time copyable type info, from Antony Polukhin. Modularization Boost version control has migrated to a system using git submodules. This shouldn't make too much of a difference to users, although the directory structure is now a bit different. Parts of some libraries have been moved into different modules, and several new modules have been extracted from existing code. All header paths should remain the same. The new modules are: * Assert: Customizable assert macros. Maintained by Peter Dimov. * Core: Core utilities used by other libraries, with minimal dependencies. Maintained by Peter Dimov, Glen Fernandes and Andrey Semashev. * Lexical_Cast: General literal text conversions, such as an int represented a string, or vice-versa, from Kevlin Henney. * Throw_Exception: A common infrastructure for throwing exceptions from Boost libraries, from Emil Dotchevski. * Winapi: Windows API declarations without <windows.h>, for internal Boost use. For details of what's in the release, see http://www.boost.org/users/history/version_1_56_0.html. Note that the links to files on this web page are for the final release - use the SourceForge link above to get the beta files. Please download the beta, give it a try, and report any problems you encounter. Thanks, -- The Boost Release Team

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Boost.Any and RTTI
by Chris Glover 27 Jul '14

27 Jul '14

Hi, I need a Boost.Any like facility that doesn't depend on RTTI, so I patched Boost.Any to utilize Boost.TypeIndex if BOOST_NO_RTTI is defined. The diff is available here; https://github.com/cdglove/any/commit/7188b13909a061495ef31f979b55f9779a9e9… Is there any interest in merging this into mainline? Or is someone working on a more correct patch than this? Thanks, -- chris

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[GSoC] Scheduled Executors beta 1 release
by Ian Forbes 27 Jul '14

27 Jul '14

Hello, I am working on implementing scheduled executors as part of GSoC 2014 and am ready to announce my beta 1 release. For more information on my project please see my original proposal at www.cs.mcgill.ca/~iforbe All my work is currently on this branch of boost.thread. https://github.com/BoostGSoC14/boost.thread.executors . I have written a fairly extensive README about design and implementation on this page. Basically a scheduled executor is an executor which guarantees that a certain task won't be run before a certain time point. Its main use cases would be things such as periodically reloading a file, pushing updates, flushing data, and polling. It has a thread safe priority queue that store tasks (currently std::function) along with a chrono::time_point. The priority queue is ordered so that the task with the least time point (closest to time 0) is at the front. There is an abstract class scheduled_executor that deals with all the enqueue methods to the executor. The ctor is protected. There are no virtual members. There are 2 subclasses. scheduled_thread_pool and scheduling_adaptor. These add dequeuing logic to the scheduled_executor by means of a worker thread(s). I'm mostly interested in people reading this part of the README: https://github.com/BoostGSoC14/boost.thread.executors#possible-changes--rfcs This details possible changes that could be made and I would like some feedback on them as these items have both pros and cons. Please provide your feedback and I will to my best to address your questions and concerns. Thanks, Ian

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Portable robust mutex an another try...
by Ladislav Sopko 27 Jul '14

27 Jul '14

Hello, I did try to continue with */Ion Gaztanaga's /*idea of portable robust mutex. I post my code and considerations in codereview. http://codereview.stackexchange.com/questions/57083/portable-c-boostiterpro… I hope to find some one to discuss about. thx -- Sopko Ladislav 3D Informatica, Via Speranza 35, 40068, S.Lazzaro di Savena - Bologna, Italy Tel: +39051450844 | Fax: +39051451942 WWW: http://www.3di.it Documentation: https://intra.3di.it/manuali/ - http://wiki.3di.it FTP: ftp://ftp@ftp.3di.it, Download:/3di, Upload:/incoming **** Informativa Privacy - Ai sensi del D. Lgs n. 196/2003 (Codice Privacy) si precisa che le informazioni contenuti in questo messaggio sono riservate e ad uno esclusivo del destinatario. Qualora il messaggio in parola Le fosse pervenuto per errore, La preghiamo di eliminarlo senza copiarlo e di non inoltrarlo a terzi, dandocene gentilmente comunicazione. Grazie. Privacy Information - This message, for the D. Lgs m. 196/2003 (Privacy Code), may contain confidential and/or privileged information. If you are not the addressee or authorized to receive this for the addessee, you must not use, copy, disclose or take any action based on this message or any information herein. If you have received this message in error, please advise the sender immediately by reply e-mail and delete this message. Thanks you for your cooperation. --

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Donation
by Avihay Eyal 27 Jul '14

27 Jul '14

Hi, my company uses boost, and we would like to donate money. Is it possible? If so, then how? Thanks.

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Permission to merge to master during release
by Glen Fernandes 26 Jul '14

26 Jul '14

The small change: https://github.com/boostorg/smart_ptr/commit/88f0a98d71 Renaming identifier of a member function from "free" to anything that is not "free" to compensate for _CRTDBG_MAP_ALLOC users in MSVC. (A colleague at Microsoft reported this to me today; he tried the 1.56.0 beta with MSVC and with _CRTDBG_MAP_ALLOC defined. It doesn't like a member function named "free"). Glen

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Help about boost library x64 used in the LibLas tools
by Luca Nardelli 26 Jul '14

26 Jul '14

Helo to all, thanks a LOT for your great work! I'm trying to use the x64 library for VS 2013 (12), but I have a lot of "unresolved errors" when I try to compile the *LibLas *library that uses boost. For example I get this error: *error LNK2001: unresolved external symbol "class boost::system::error_category const & __cdecl boost::system::system_category(void)" (?system_category@system@boost@@YAAEBVerror_category@12@XZ)* Could you maybe help me or give some hint? Thanks!!! -- "Il miglior modo per cambiare e iniziare"

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C++ committee meeting report
by Beman Dawes 25 Jul '14

25 Jul '14

The C++ committee met last week in Rapperswil, Switzerland. Actions that might be of interest to Boosters include: * Shipped the File System TS for ISO DTS (i.e. final) ballot. Since it would be very unusual for at DTS ballot to fail, the File System TS is essentially done. The committee is now actively looking for File System TS 2 proposals. My work now shifts to bringing the Boost implementation into compliance. * Shipped the Library Fundamentals TS for ISO PDTS (i.e. preliminary) ballot. This TS includes Boost.Any and Boost.Optional. * Voted to start work Library Fundamentals TS 2. The plan is to issue a continuing stream of Library Fundamentals TSes, with work starting on the next TS as soon as content for the current TS freezes. Hopefully Boost developers will submit proposals for this TS too. It will be a good home for small libraries that don't need a whole TS of their own. * Shipped the C++ Extensions for Parallelism TS for ISO PDTS (i.e. preliminary) ballot. * The Library Evolution Working Group (LEWG) voted to base the Networking TS on Boost.ASIO. That was a major surprise, as a Networking Study Group had been trying to build up a Networking TS from many small proposals. But in LEWG polls, support for ASIO was overwhelming, with no one at all voting against. This was a major vote of confidence for Boost.ASIO and Chris Kohlhoff. And several ASIO supporters were not even in the room at the time because Filesystem issues were being worked on elsewhere. The next C++ committee meeting is November 3rd to 8th in Urbana-Champaign, IL, USA. As always, Boosters welcome. --Beman

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[rational] Inadvertent construction from double
by Andrzej Krzemienski 25 Jul '14

25 Jul '14

Hi, I have encountered something I consider a bug in boost::rational's interface. Its documentation discusses in detail why conversion from double is not supported, but the following code works fine: #include <iostream> #include <boost/rational.hpp> int main() { double d = 31.82; boost::rational<int> r = d; std::cout << r << std::endl; } With the following result: 31/1 It just discards the fractional part. Such conversion is really confusing an I claim should be explicitly deleted. Regards, &rzej

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